METEOROLOGICAL OBSERVATIONS AT WISLEY IN 1907. 



523 



the mean temperature being well above the average. During the last week 

 the weather became very rainy, and in places snow and hail fell, whilst 

 thunderstorms were reported from a few districts. Fogs were of rather 

 frequent occurrence throughout the month. On the whole the month was 

 a dry one ; slightly colder than usual in the west but warmer than usual 

 elsewhere ; and with a somewhat irregular distribution of sunshine. 

 Observations made at Wisley : 



Mean temperature of the air in shade 





440.7 





Highest 





60°-5 on the 9th 



Lowest ,, ,, ,, 





27°-l 



„ 22nd 



Lowest ,, on the grass 





22°-0 



„ 30th 





At 1 ft. 



At 2 ft. 



At 4 ft. 





deep. 



. deep. 



deep. 



Mean temperature of the soil at 9 a.m. ... 



46°-3 



49°'0 



50°-5 



Highest „ ,, „ 



49°-7 



51°-4 



52°-3 



Lowest „ ,, 



41°-7 



45-3 



48°-0 



Mean relative humidity of the air at 9 a.m. (complete saturation being 



represented by 100) 92% 



Rain fell on 13 days to the total depth of ... 1-83 in. 



(Equivalent to about 85 gallons of water per square yard.) 



Heaviest fall on any day 0*38 in. on the 26th 



The winds were distributed pretty evenly round the compass. 

 The average velocity of the wind was 4| miles per hour. 



There were 41| hours of bright sunshine, equal to 16 per cent, of the greatest 

 possible amount. There were 16 days on which no sunshine was recorded. 



December. — The weather of the closing month of the year was of an 

 unsettled character, but up to Christmas it was comparatively warm, frost 

 being rarely experienced, with a good deal of rain. During the last week, 

 however, the winds shifted from the westward to the eastward, and with 

 the change the air became very dry, and although the temperature was not 

 particularly low, yet the winds were very bitter and unpleasant, and there 

 was very little increase of warmth during the day. Snow was experienced 

 at various times, but generally the falls were only slight. Over the south- 

 eastern counties there was a fair amount of sunshine, but generally 

 speaking the month was not a bright one, and the sunshine was very 

 variable in its distribution. 



Observations made at Wisley : 



Mean temperature of the air in shade 42°-2 



Highest „ „ ,, 57°-0 on the 8th 



Lowest „ „ „ 28°-4 „ 16th 



Lowest ,, on the grass ... 23°*1 „ 16th 



At 1 ft. At 2 ft. At 4 ft. 

 deep. deep. deep. 



Mean temperature of the soil at 9 a.m 42°-l 44°-4 46°-4 



Highest „ „ „ 45°-8 46°-l 47°-9 



Lowest „ „ „ 37°'5 41°-0 44°-6 



Mean relative humidity of the air at 9 a.m. (complete saturation being 



represented by 100) 88% 



Rain fell on 13 days to the total depth of 2-70 in. 



(Equivalent to about 12^ gallons of water per square yard.) 



Heaviest fall on any day 0-43 in. on the 13th 



The prevailing winds were south westerly, and then easterly. 

 The average velocity of the wind was 9| miles per hour. 



There were 56 hours of bright sunshine, equal to 23 per cent, of the greatest 

 possible amount. There were 9 days on which no sunshine was recorded. 



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